There are two classes of meaning of 'token' in computing:
An object which represents the (often exclusive) right to perform some operation:
* Petri net|Token (Petri Net) , an object used in Petri net theory
* Session token , a unique identifier which is generated and sent from a server to a software client to identify an interaction session and which the client usually stores as an HTTP cookie
* Security token (also known as a hardware token, authentication token or cryptographic token), a physical device that an authorized user of computer services is given to aid in authentication
* Access token , a system object representing the subject of access control operations
* Token ring , a local area network technology in which a virtual object known as a token is passed between devices on the network, authorizing them to communicate
* invitation system|Invitation token , sometimes called a "code", sometimes used as a method of curbing website registration for a number of purposes
An atomic object in parsing:
* Token (parser) , usually a word or other atomic parse element
* Tokenizing , the operation of splitting a string of characters into a set of tokens in lexical analysis
Other
Type-token distinction|Token (type) , an instance of a type in logic, computational linguistics, and information retrieval
